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| 02:06.25 | *** join/#qi-hardware lukedashjr (~luke-jr@unaffiliated/luke-jr) |
| 16:38.30 | kristianpaul | o/ |
| 17:18.28 | xentrac | hello.kt:3:7: error: expecting an element |
| 17:18.28 | xentrac | <PROTECTED> |
| 17:18.28 | xentrac | <PROTECTED> |
| 17:18.28 | xentrac | hello.kt:3:5: error: unresolved reference: o |
| 17:18.28 | xentrac | <PROTECTED> |
| 17:18.42 | xentrac | I mean hi! |
| 17:36.23 | *** join/#qi-hardware mth (qkqjooby@193.22.133.58) |
| 18:23.53 | wpwrak | xentrac: i see that DocScrutinizer51 is around. he's the one you're looking for with your audio circuit. |
| 18:31.26 | xentrac | hi DocScrutinizer51! |
| 18:31.49 | xentrac | I was asking about https://is.gd/reactivedac in this case |
| 18:33.11 | xentrac | the left-hand part of the circuit is generating PWM, the lower right uses two capacitors and a transformer to reactively filter the PWM signal |
| 18:33.54 | xentrac | well, a center-tapped inductor, really |
| 18:34.52 | xentrac | I got this idea of using an inverter to reduce the PWM ripple on the output from this EDN article by Stephen Woodward: https://www.edn.com/design/analog/4329365/Combine-two-8-bit-outputs-to-make-one-16-bit-DAC |
| 18:35.58 | xentrac | but I wanted to do the filtering purely reactively (or as close to purely reactively as possible) in order to maximize the power efficiency |
| 18:38.31 | xentrac | eyeballing the plots, it does seem like it achieves better filtering than *just* the RLC low-pass filter corresponding to the relevant part of the transformer and the output cap |
| 18:39.14 | xentrac | but I feel like I don't know enough about filter design to know if a Ï LC filter or something would work better with the same number of reactive components and no inverter |
| 18:39.27 | xentrac | what do you think? |
| 18:41.25 | xentrac | (apologies for using Falstad's simulator here; I don't know how to use SPICE or WR-SPICE yet) |
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